Fluid injector



Aug. 30, 1932. KRUEGER 1,875,023

FLUID INJECTOR Filed Sept. 22, 1930 2 Sheets-Sheet l R. E. KRUEGER FLUID INJECTOR Aug. 30, 1932.

Filed Sept. 22, 1930 2 Sheets-Sheet 2 I l I I l Y Y liw/entor mailf ue yer @W Z J- Patented Aug. 30, 1932 UNETED STATES PATENT OFFIE RICHARD E. KR'UEGER, F MADISON, WISCONSIN, ASSIGNOR TO GENERAL LABOR-A- TORIES, INCL, OF MADISON, WISCONSIN, A CORPORATION OF DELAWARE FLUID INJECTOR Application filed September 22, 1930. Serial No. 483,482.

7 This invention relates to fluid injectors, and is in the nature of an improvement on prior application No. 410,624, filed November 29, 1929.

Generally stated, the object of the invention is to provide a novel and improved construction of Venturi tube for use in an injector of this kind, whereby the throat of said-tube can be easily removed without dis- 0 turbing the other parts, for cleaning or other purposes- It is also an object to 'provide certain details and features of construction tending to increase the general efficiency of a Venturi 5 tube for this particular purpose.

To the foregoingfand other useful ends, the invention consists in the matters hereinafter set forth and claimed, and shown in the accompanying drawings, in which,

' so i Fig. 1 is a side elevation of a fluid injector embodying the principles of the invention, showing the Venturi tube more or less in longitudinal section.

Fig. 2 is a vertical section on line 2-2 in a Fig. 1 of the drawings.

. Fig. 3 is a detail section on line 3-3 in Fig. 2 of the drawings.

Fig. 4 is a detail section on line 4-4 in Fig. 1 of the drawings.

As thus illustrated, the invention comprises a front section 1, which is preferably concave inside and convex outside, being substantially one-half of aspherical body, the other half being a similarly shaped rear sec- 1 3 tion or cover 2, the two sections being clamped together, with a rubber diaphragm 3 between them, by the clamping bolts 4 that extend through the meeting flanges of thetwo sections. The section 1 has a top inlet 5'for the 0 liquid which is to be ejected into the water, a f suitable closure 6 being provided to seal the top of this opening or inlet, after the substantially spherical reservoir or storage chamber? is filled or charged. This chamber has a bottom outlet 8 in the section 1, and the section 2 has a top water inlet 9, and a bottom water outlet 10, or valve drain, whereby the water can be drained out after the disinjfectant or other liquid has been discharged through the outlet 8 into the Water or other liquid. A Venturi tube 11 disposed horizontally and secured laterally against the seat 12 formed on the side of the section 1 by screws 13 inserted through the flat bracket portion 14 of the said Venturi tube. A valve plug 15 is inserted through the Venturi tube, vertically, having a lateral inlet 16 communieating with the throat 17 of the Venturi tube, which inlet 16 communicates also with the outlet 8 previously mentioned. A tube 18 is screwed into the Venturi tube, as shown in Fig. 2 of the drawings, and projects a distance into the passage 8 previously mentioned, being of smaller diameter than said passage.

The water enters the Venturi tube through the valve 19 at the left in Fig. 1, and escapes from the Venturi tube through the similar valve 19 at the right in Fig. 1, whereby the water has a straight course through the injecting device. The Venturi tube 11 has an outlet 20 at a point some distance in advance of the opening 16, previously mentioned, and this outlet 20 is connected by a pipe 21 with the needle valve device 22, which latter Is in turn connected with the inlet passage 9, i previously mentioned, by the connection 23, as shown in Fig. 4 of the drawings. In this way, the water pressure from the outlet 20 through the connections to the inlet 9 can be regulated to suit the requirements. In a Venturi tube, such as shown, the water pressure will be greater at 20 than at 16. and the differential between these two points is sufficient to cause the water to pass upwardly through the pipe 21 and into the inlet 9, and from the latter into the space between the section 2 and the diaphragm 3, previously mentioned. This pressure continuing, the contents of the chamber 7 which is the space between the diaphragm 8 and the section 1. will be gradually forced out, through the outlet 8 and through the passage 16 and the tube 18, into the stream of water passing through the throat 17 of the Venturi tube, whereby water escaping through the valve 19 at the right will contain the disinfectant or other liquid. There are many liquid preparations, of course, for treating or purifying water, such as the water used for domestic purposes, but such liquid preparations need not be here described, as the ini vention is not limited to any particular liquid or compound for this purpose.

After the chamber 7 has been discharged of its contents, the Water can then beshut off with the valve 19 at the left and the water removed from behind the diaphragm. 3' by opening the drain valve 10. When the water is discharged from the injector, in a manner that will belreadily understood,-andi'the a1)- paratus is again filled or charged, 'through' the top inlet 5, the diaphragm 8 will then return to the position shown in Figsl 2" and 3 of the drawings p A 'A' small valve 24 can be used at'the point shown, and this valve can be opened torelieve the apparatus of airduring the filling operation, and to test the apparatus, the glass 7 sight-tube can be employed inthe water connection plugv to valve 225,v so. that it: can be observed whether the water is flowing downwardly in this connection, in: the required manner, after the valvesu19. and 22 are opened,

The. construction shownand described is simple and comparatively inexpensive and facilitates opening theapparatus for inspec- 7 tion or repairs. Forexample, the back secs tion 2-c'an vberemoved by simply removing the nuts from the bolts 4:,thus permitting the removal ofthe diaphragm 3, a-swell without disturbing or breaking any ofthe 'pipe'connections; Moreover, by providing a precipitation takes place 1 which clogs the tube at the point of contact between the liquid and the water. Thus the portion of the tube that clogs can be removed and cleaned. And, in addition, another advantage of this construction is that'the' plug can be used as a valve to stop dosageor injection of the liquid into the water when such is necessary or desirable and, furthermore, this valve may also be used to advantage during the filling of the container.

The tube 18-"is found to of advantage v in the injection of the liquid into thev water,

and the flat seat 12'is also'oi advantage in holding the V enturitube detachably in place, as hereinafter explained,

The diaphragm 3 is preferably of rubber, or other flexible material, and is-preferably molded to normally assume the shape shown inthe drawings, whereby this diaphragm normally conforms to the inside contour of the secti0n2 of the container. In this way the diaphragm has no tension or resiliency that v wouldtend to force the liquid into the stream of water, sothat the water pressure itself is alone responsible for the injection or the liquid into the water. Furthermore, as the.

diaphragm is practically hat-shaped, it can turn wrong sideout, so to speak, and can'be made to conform to the interior of the section 1 of the container when the liquid is entire- 1y discharged into the WfLtGIlflIlCl, in such'position the diaphragm willremainuntilforced back into normal position by a refilling or re charging of the liquid reservoir through the l inlet 5, as previously described. Thed iaphragmlg, or other suitable pressure responsive means or element, forms a structural separation between one liquid and the other the "connections'20,"21, 22 and 25into one 3- coinpartment, and from; the latter into the other compartment, there beingaphysical or I structural. separati on: between thewater presliquid, whereby water cannot pass through I sure compartment and the'solution compart- ,ment, whereby entrapment. of air in either.

or both compartments is. unnecessary, and; is entirely avoided. 1 The tube 18 has three functions :To center the Venturi tube accurately in place during assembling; tohold the gasket in place. onseat;

12 during assembling; and to reduce. thedilutionof the chargeunder minor fluctuations ot preseurepdue to. small; diameter of com- I I paratively great lengtlrof tube. 1"

What I claim as my invention is j j 1 aliquid injector, the combination of instrumental-itiesforming a. passage for. the

7 liquid that is to receive the injectiontherein of. another liquid, having provisionsto provide a dili erential pressure; asbetweerr two successive points in said passage, and pros sure-operated means forming a structural 2 separation between one liquid: and the other and responsive to and operable/by thehigher pressure at one pointto-force said otherhquidv intosaid passage at said other point", said instrumentalities and, provisions comprising portion provided with a. lateral inlet at the point ofgreatestrestriotionof said. tube,.said, removable. throat portion comprising a tapered plug' having a straight bore forming said. restrictiomiand having said lateral inlet located at the middle of said bore for the" I liquid to be injected into the other liquid;

2. In; a liquid injector, the combination of 3a. Venturi-tube having a removable throat instrumentalities forming a passage forthe 7 liquid that is toreceive the injection therein of another liquid, having provisions to'pro vide a differential pressure as between two successive points in said passage-and pres- .sure operated -means forming a structural separatlonbetween one liquid and: the other and responsive to and operable by the "higher pressure at one point to force said other liq--' uid into said passage at said other'point, said instru-mentalities and provisions comprising a' Venturi tube having a {removable throat 1 portion provided with a lateral inletat the point of greatest restriction of said tube, said throat portion having said lateral inlet for the liquid to be injected into the other liquid, said inlet comprising a tube projecting from the inner side of the Venturi tube, and said injector having a bore enclosing said inlet tube, the bore being of greater diameter than the inlet tube.

3. In apparatus for handling liquids, a Venturi tube provided with a removable throat portion, forming the greatest restriction of the tube, the opposite end portions of said tube having longitudinal passages tapered to the diameter of the opposite ends of said restriction, said removable throat portion comprising a rotary valve plug which is removable axially from the Venturi tube.

4. In a liquid injector, the combination of instrumentalities forming a passage for the liquid that is to receive the injection therein of another liquid, having provisions to provide a diflt'erential pressure as between two successive points in said passage, and pressure operated means forming a structural separation between one liquid and the other and responsive to and operable by the higher pressure at one point to force said other li uid into said passage at said other point, said instrumentalities and provisions comrisin a Venturi tube havin a removable throat portion, said throat portion having a lateral inlet for the liquid to be injected into the other liquid, said inlet comprising a tube projecting from the inner side of the Venturi tube, and said injector having a bore enclosing said inlet tube, the bore being of greater diameter than the inlet tube.

Specification signed this 18 day of September, 1930.

RICHARD E. KRUEGER. 

